Description of the device
1.2 PROFIBUS interface
CP 5612
Operating Instructions, 05/2021, C79000-G8976-C278-04
11
1.2
PROFIBUS interface
PROFIBUS network
The physical link between the PROFIBUS interface and the PROFIBUS network is via a floating
RS-485 interface that is part of the module. Depending on the network configuration, data
rates of 9.6 Kbps up to a maximum of 12 Mbps are possible in the PROFIBUS network.
Note
You will find information about the structure of a PROFIBUS network in the system manual
"PROFIBUS Network Manual". The document is part of the Manual Collection. You will also
find this on the Product Support pages under the following entry ID:
35222591 (
http://support.automation.siemens.com/WW/view/en/35222591
PIN assignment
The D-sub female connector has the following pin assignment:
PIN
Short name
Meaning
Input/output
1
NC
Socket pin 1 is not connected.
-
2
NC (M24)
Socket pin 2 is not connected. With other MPI/DP components,
the return line of the floating 24 V power supply may be via this
pin.
-
3
LTG_B
Signal line B of the PROFIBUS connector.
Input/output
4
RTSAS
RTSAS, input signal for direct MPI link. The control signal is "1"
active when the automation system connected over a special
MPI cable is sending.
Input
5
M5EXT
M5EXT return line (GND) of the 5 V power supply and reference
potential for the signals RTSAS and RTS of the PROFIBUS inter-
face.
Output
6
P5EXT
P5EXT power supply (+5 V) for the 5 V power supply.
(only for bus termination)
Output
7
NC (P24V)
Socket pin 7 is not connected. With other MPI/DP components,
the P24V supply of the floating 24 V power supply may be via
this pin.
-
8
LTG_A
Signal line A of the PROFIBUS connector.
Input/output
9
RTS
RTS output signal of the CP module. The control signal is "1"
active when the device (PG or PC) is sending.
Output
Shield
The shield is connected to components of the connector hous-
ing.
